Temperature-controlling device



C. WEEKS. TEMPERATURE'CONTROLLING DEVICE.

APPLICATION FILED MAR. s. 1919. RENEWED NOV. 8. 1920.

1,371,957., Patented Mar. 15,1921

anucmfo'z C har/es Weeks.

UNITED STATES PATENT OFFICE.

CHARLES WEEKS, OF, PALO ALTO,

TUBING- CO., OF SANTA CRUZ,

TEMPERATURE-CONTROLLHTG DEVICE.

Application filed March 3, 1919, Serial No. 280,376.

T 0 all whom it may concern.

Be it known that I, CHARLES VVEEKs, citizen of the United States, residing at Palo Alto, in the county of Santa Clara and State of California, have and useful Improvements in Temperature- Controlling Devices, of which the following is a specification.

y invention is a temperature controlling device, particularly useful for controlling the temperature of incubators.

The object of the invention is to control or maintain a predetermined temperature within incubators, or like devices, by means which are influenced by temperatures internal and external to the incubator. The invention resides in the sundry details of construction, combination and arrangement of parts hereinafter described.

The preferred embodiment of the invention is illustrated in the accompanying drawing which should be read together with this specification;

Referring to the drawing:

'Figure 1 is a side elevation of my invention applied to an incubator which is shown in section. I

Fig. 2 is an enlarged view partly in section and partly in side elevation of a portion of the device.

Flg. '3 is a plan of the thermostats as shown in Fig. 2.

In the drawing 1 indicates a tubular standard, the lower and upper ends of which are externally threaded and screw into threaded openings in lower and upper brackets 2 and 3. Lock nuts 4 and 5 screw on the threaded ends of said standard against brackets 2 and 3 and lock the brackets against turning on said standard. A U- shaped hanger 6 is suspended on the bracket 2 and is secured to thebracket by bolt 7 and nut 8. An elongated light lever 10 is fulcrumed horizontally in the hanger 6, said lever comprising an intermediate member 11, pivoted by pivot 12 in hanger 6, and rods 13 and 14 screwed into the respective ends of said member 11. The rods 13 and 14 may be unscrewed from member 11 and other rods of different "length substituted as desired. A screw 15 extends vertically through said memberll of lever 10, and on the upper end of said screw is mounted a thermostat 16, composed preferably of a pluralityof intercommunicating units 17 and Specification of Letters Patent.

invented certain new Patented Mar. 15, 1921. Renewed November 8, 1920. Serial No. 422,702.

18 of hollow construction formed with an intercommunicating port 19. The screw 15 has a knurled head 20 by means of which it is turned to raise and lower the thermostat 16 with relation to lever 10. A look nut 21 screws on the screw 15 against the lever member 11 and locks the screw and the thermostat in adjusted position with relation to said member 11. A thermostat 25. similar in construction to thermostat 16, is mounted in bracket 3. Said thermostat has a vertical stud 26 extending from its upper wall through an opening 27 in bracket 3 and is formed with a shoulder 28 which rests upon a spring 29 secured by screw 30 to said bracket and spring against a screw 31 in said bracket and against said stud, whereby the thermostat is mounted in the bracket.

ings 33 and 34 in the lower and upper ends of said tube and bears at its ends against the upper wall of thermostat 16 and against the lower wall of thermostat 25. The standard 1 extends through an aperture in the lower wall of an incubator 35 so that the upper thermostat 25 rests within the incubator and the lower thermostat 16 rests below and outside of the incubator. A collar 36 secured on'the standard 1' by a set screw 37 rests upon the bottom wall of the incubator and determines the vertical 0- sition of the rod 1 and the height of the thermostat 25 within the incubator. The outer end of rod 14 of lever 10 is connected by link 38 to the incubator lamp 39 which discharges its heat through a flue 40 into the incubator. A weight 41 is adjustably secured on the lever rod 13 by set screw 42. My invention is adapted to actuate the lamp 39 to maintain a uniform temperature within the incubator under all conditions. Under normal heating conditions the lever 10, under the influence of weight 41, is limited in its movement to the position shown in Figs. 1 and 2, by the engagement of thermostats 16 and 25 with rod 32, in which position of the lever, the lamp 39 is allowed to discharge an amount of heat into the incubator suflicient to heat the incubator to a predetermined temperature. When the outside atmosphere becomes colder, the thermostat 16 contracts, and through the screw 15, swings the lever 10 and actuates the lamp 39, causing the lamp to discharge more heat into the incubator to keep up the same normal temperature therein, which would otherwise be lowered by the falling outside temperature.

When the outside temperature becomes higher or returns to its normal condition, the thermostat 16 expands moving the lever 10 against the influence of the weight 41 to requires less heat from the lamp to maintain its normal-temperature, when the outside atmospheric temperature is normal than when it is low.

When the temperature inside the incuba- V tor rises above normal, the thermostat 25 expands and, through rod 32, thermostat 16 and screw 15, swin s lever 10 and actuates lamp 39, causing t e lamp'to reduce its supply of heat to the incubator and lowering the temperature of the incubator to In a device of the character described, a

heat controllinglever, a bracket provided with an opening, a thermostat having a stud thereon formed with a shoulder and extending through said opening in the bracket, a spring on the bracket for engaging shoulder and holding the thermostat 1n position within the bracket, and an operative connection between said lever and thermostat when the latter is in position in the bracket.

In testimony whereof I afiix my signature.

CHARLES EEKS.

said I 

